Absorption refrigeration system



Sept. 4, 1934. G. F ZELLHOEFER 1,972,580

ABSORPTION REFRIGERATION SYSTEM Filed March 16, 1933 frzz/e/z/Of GLEN/V F. ZELLHOEFER Patiited sept. 4, 1934 UNITED STATES.. PATENT f opFlc'E,

I 1,972,560 ABsoRrnoNnEFarGEaATroN srs'ram Glenn F. zeuhoefer, loaminmn, 111." Applieaton March 16, 1939, serai No. 660,981

s claims. (ciauz-189) This invention relates to improvements in absorption refrigernting units and more particularly to the construction of `a still to be` employed in an absorption refrigeration system such as disclosed in this applicants prior application, Serial No. 651,306, filed January 12, 1933.

It is an objectv of this invention to provide a still which is simple in construction and emcient in operation and in which the refrigerant is -quickly and elciently separated from the solu- With these and otherobjects in view, reference is made tothe accompanying sheet of drawings which illustrates a preferred form of this invention, with the understanding that'minordetail changes may be made withoutA departing from the scope thereof.

In the drawing;

Figure 1 is a view partly in central longitu- 2'0 dinal vertical and partly in side elevation of this improved still.

Figure 2 is a View in transverse section taken on the line 2-2 of Figure 1 looking in the direction of ,the'arrcws Figure 3 is a similar view taken on the-line 3-'3 of Figure 1 looking in the direction of .the

arrows.

This still preferably includes a metallic cylinder 1 having end closures 2 mounted on axial supports 3 engaged by legs 4 to support the cylinder in horizontal position. A steam jacket 5 is placed about a portion of the exterior ofthe cylinder 1 which steam jacket is connected by f the pipe 6 leading to aJ source of steam and preferably entering the upper side of the steam jacket which jacket is also provided with a return .pipe 7 preferably leading from the bottom of the jacket. The steam jacket provides not only heat for distilling off the refrigerant, but also 4'0 acts as a preheater for the strong liquor or the solution which is led from'the absorber by means of pipe 8' after'passing through the concentric coils 9 by the way of pipe 10 to the coil 11 about the exterior otthe cylinder 1 within the steam 4'5 jacket 5. 'The strong liquor after'passingthrough this coil 11 within the steam jacket is led through a connection 12 to a discharge pipe 13 extending axially through one of the end closures 2 into the interior of the cylinder. This connection 12 may be of any desired form and need not be constructed in the manner shown as long as it conducts strong liquor from the coil 11 to the discharge pipe 13. The discharge pipe 13 is provided with a plurality of spray nozzles 14 arranged along its upper side whereby the solution of the refrigerant and solvent is discharged upward against the walls of the cylinder. 1 in the form of a spray. The spraying of the strong liquor within the heated cylinder 1 and thecontact of the spray against the heated walls thereof readily causes the'refrigerant to leave the solution and pass from the still through the pipe 15 in gaseous form to the rectifier, if one is employed, condenser, and receiver from which it is .admitted into the evaporator of the system. It is preferable to have the pipe 15 lead from the upper portion of the end closure 2 opposite the entrance of the pipe 13 and to prevent the sprayed solution from passing into the pipe 15 with the gaseous refrigerant, abeille 16 is secured to the 70 upper wall of the interior oi." the cylinder 1 between the last spray nozz1ef14-and the opening of the pipe 15.

The weak liquor or solvent collecting in the bottom of .the cylinderis returned 'by pipe 17 75 to the absorber. 'Ihe pipe 17 is passed within the coils 9 so that the heated weak liquor or solvent travels in an` opposite direction from the strong liquor coming from the absorber and traveling about the exterior of the pipe 17 as it trav- 80 els through the pipes 9 on the way to the preheating coils 11 so that the coils of the pipes 9 enclosing the pipe 17 forms a heat exchanger. The pipe 17 after having passed through the coils 9 is thenA passedv through a residual heat coil 85 18 which is connected to. a source of water supply wherebywhatever heat may remain in the weak liquor is removedby the residual heat coil before the pipe 16 discharges the weak liquor to the absorber.

It is preferable to surround the `coils 9 and 18 with an outer cylindrical casing 19 with end closures 20 and fill the space in between the outer casing coils, steam jacket, and cylinder with heat insulating material such as asbestos Wool. 95

What I claim is:

1. In an absorption refrigerating system, a combined still and heat exchanger including a closed still casing, a steam jacket surrounding said casing, an outer spaced-apart casing, an 10o axial strong liquor discharge pipe within the still casing provided with a plurality of spraying nozzles, a coil of strong liquor pipes leading from the absorber of the system arranged about the still casing within the outer casing, a coil of strong liquor pipes within the steam jacket connected to said outer coil and to the said discharge pipe, a pipe communicating with the interior of the still for leading the gaseous refrigerant distilled from the strong liquor solution to the system, a pipe for leading the weak liquor from which# the' refrigerant has been distilled from the still to the absorber of the'sys'tem, said latter pipe being of less diameter than the strong liquor pipe coiled about the still and passed through said coil to form a heat exchanger.

2. The structure of claim l wherein the space between the casings and about the coil therein is packed with heat insulating material.

3. The structure of claim 1 wherein a residual 

